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black whale,name for the right whaleright whale,
name for whales of the family Balaenidae. They were so named by whalers, who for centuries considered them "the right whales" to hunt, because they float when killed and because they yield enormous quantities of oil and of baleen.
..... Click the link for more information. and for the sperm whalesperm whale,
largest of the toothed whales, Physeter catodon, found in the Atlantic and Pacific oceans. It is also called cachalot. Male sperm whales may grow to more than 70 ft (21 m) long and females to 30 ft (9 m).
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